Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of foreign currency options designated as cash flow hedges (Details 6)

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Fair Value Measurements and Derivatives - Effects of foreign currency options designated as cash flow hedges (Details 6) - Designated as Hedging Instrument - Cash Flow Hedging - Foreign currency options - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other comprehensive income (loss) - effective portion   $ (1,157) $ (3,304)
Loss recognized in other income (expense) - ineffective portion   (241) (97)
Amount reclassified from other comprehensive income (loss) into interest expense, net $ 1,320 $ 1,269 $ 470